WATERTOWN, New York (WWNY) - Jefferson County is monitoring 100 cases of lead poisoning.

According to the county Public Health Service, the most common exposure source for children is lead-based paint, which was used in many homes built before 1978.

Jefferson County has a large percentage of older housing. Approximately 75 percent of homes in the county were built prior to the ban on lead-based paint and as a result, may contain lead hazards.

People can get lead into their bodies by breathing in lead dust (especially during activities such as renovations, repairs, or painting) or by swallowing lead dust that settles in food, food preparation surfaces, floors, and windowsills.

Young children have been known to be poisoned by eating paint chips and soil that contain lead.

Most children have had some contact with lead, so New York state requires health care providers to test all children with a blood lead test when they’re 1 and 2 years of age.

“Children are developing and their bodies and brains are growing. At that age, lead can cause behavioral issues. It can lead to developmental delays. Later in life you can see issues with students in school and it can lead to underperformance in school as well,” said Cecilia Wirth, Jefferson County Public Health specialist.

This is National Lead Poisoning Prevention Week and county officials are promoting awareness.

If you suspect you or your child are at risk of lead poisoning, it’s recommended that you contact your physician and get tested.

For more information on lead poisoning prevention, click here.

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